Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff897d91024706d4…

MALICIOUS

PDF

86.6 KB Created: 2021-07-21 16:44:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: df802872d4866fbad2344ec22bd54bde SHA-1: 3e80a39c482d2aa7925f64771e2e07c796739a64 SHA-256: ff897d91024706d47a7d8933c01e940576064c3ed3301e1ecb2bea640b6ed070
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/765700eeb3f27c4eb30f9c9d6c44dd9f/denulubulunuvozerojamo.pdf In PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/10edea0bee188794f80ebc77e7a3bfb9/87944385346.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a92c70854a1---98915517534.pdfIn PDF document text
    • http://karmand24.ir/basefile/ehotel724ir/files/zunidegitelufuwa.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/g9r7diutu2kdt3ep4pfjbtbrnr/98623284751.pdfIn PDF document text
    • http://dochoiotovn.com/uploads/userfiles/file/6824379135.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160e7aa00aeda7---43593671701.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/19c60377004a9fdb6cd6a2451a7781c6/ronewoxodekuvagaselokabik.pdfIn PDF document text
    • https://amerismithenterprises.com/wp-content/plugins/super-forms/uploads/php/files/6403f9a856aaf9f64ce2ab03645b694f/4621322081.pdfIn PDF document text
    • http://duquenne-moteurs.fr/webroot/upload/files/59281440571.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/istlb2iogievvqmgvtj7ohulf5/47595961624.pdfIn PDF document text
    • https://needlugs.com/userfiles/files/giweloguga.pdfIn PDF document text
    • http://teresachild.com/upload/files/34091050238.pdfIn PDF document text
    • http://libertyquad72.fr/userfiles/file/92527585028.pdfIn PDF document text
    • http://irinaburmistrova.ru/files/makatipiri.pdfIn PDF document text
    • https://alquimia.in/admin/fckeditor/editorfile/kiwawumerewozoni.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/90980888941.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607432aeb714f---gedove.pdfIn PDF document text
    • http://clasesholandes.com/userfiles/file/pibekurigunatebifasoriv.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1606c99d12f6ac---8139536772.pdfIn PDF document text
    • http://lasfyy.com/uploadfile/file/20210721022504085.pdfIn PDF document text
    • http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a51d8ec6374---12338125138.pdfIn PDF document text
    • https://martabaktelor.com/contents//files/datevofamitikune.pdfIn PDF document text
    • https://thietbiytedaibao.com/media/files/98830501948.pdfIn PDF document text
    • http://tyextractor.com/d/files/tuferap.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=conjuring+1+full+movie+in+tamil+download+hd+1080p+tamilrockersPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e930.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE930 17372 bytes
SHA-256: fc6e5ed14ec786233396f040f4fd4e731eb128f444ce737fbbc97a2c92b4377d
font_01_sfnt_off000116ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012f05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F05 11952 bytes
SHA-256: 2816f9516ed54a09cf7e9edd1d02658ca10bb52bca9f29a4d96e5cbea30b0874

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